[FFmpeg-user] Creating Motion JPEG 2000 Images

[Aaron Boxer]

Hi Oliver,

Thanks very much for your reply. I want to create mj2 files to test an mj2 reader. So, what I really need are some mj2 test images - I have only been able to find one so far on the internet.
If you know where I can find more, that would also be great.

Thanks,
Aaron




On Monday, 29 July 2024 at 15:40, Oliver Fromme <oliver at fromme.com> wrote:

> 
> 
> Aaron Boxer via ffmpeg-user wrote:
> 
> > I am able to play back mj2 clips with ffmpeg; can I also create mj2 files
> 
> > by converting from say mp4 ?
> 
> 
> No, unfortunately that's not supported.
> Excerpt from the output of ``ffmpeg -formats'':
> 
> D mov,mp4,m4a,3gp,3g2,mj2 QuickTime / MOV
> 
> The "D" in the first column means that FFmpeg can only read these
> files, but not write them. Basically, .mj2 files are just MP4
> containers (or Quicktime) with frames that are JPEG-2000 images.
> 
> There are also "raw" MJPEG2k files, but FFmpeg cannot write them
> either (this is a raw stream of JPEG2k images):
> 
> D mjpeg_2000 raw MJPEG 2000 video
> 
> Just out of curiosity, why do you need to create MJPEG2k files?
> In general, I recommend against doing that, unless you need it
> for compatibility with a certain piece of hardware or software
> that isn’t able to handle anything else.
> 
> Best regards
> -- Oliver
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